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RE: Differentiated Routing, not only plain rambo-SPF

"Ayyasamy, Senthilkumar (UMKC-Student)" <saq66@umkc.edu> Mon, 05 August 2002 18:32 UTC

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Subject: RE: Differentiated Routing, not only plain rambo-SPF
Date: Mon, 05 Aug 2002 13:26:46 -0500
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Thread-Topic: Differentiated Routing, not only plain rambo-SPF
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From: "Ayyasamy, Senthilkumar (UMKC-Student)" <saq66@umkc.edu>
To: "Naidu, Venkata" <Venkata.Naidu@marconi.com>, Hummel Heinrich <Heinrich.Hummel@icn.siemens.de>
Cc: "Naidu, Venkata" <Venkata.Naidu@marconi.com>, jnc@ginger.lcs.mit.edu, fred@cisco.com, irtf-rr@puck.nether.net, routing-discussion@ietf.org
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>  -> - scalability: Since you are maintaining multiple Routing
> -> tables, doing at line rate is pretty difficult and hence
> -> doesnt scale well.
> I agree with you here. Yes! there are performance and
> scalability problems if we go for DiffRouting in a
> hop-by-hop fashion. Then you have to maintain
> different route tables, line rate forwarding issues etc etc.
>
> That is why we went for source routing (using MPLS-TE).
> That effectively solved the problem of maintaining
> multiple routing tables. Connection-less to connection-oriented
> move (with small fixed length label lookup) solved the
> problem of line rate forwarding (directly or indirectly).
> 
>  Now we are moving towards MPLS-TE with DiffServ.
who told you diffserv-aware MPLS -TE scalable? 
Section 4.4 and 3.1 of http://www.ietf.org/internet-drafts/draft-ietf-tewg-diff-te-reqts-05.txt clearly points out the scalability problems.
  

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